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/*
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 * Matroska file demuxer (no muxer yet)
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 * Copyright (c) 2003-2004 The ffmpeg Project
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/**
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 * @file matroska.c
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 * Matroska file demuxer
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 * by Ronald Bultje <rbultje@ronald.bitfreak.net>
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 * with a little help from Moritz Bunkus <moritz@bunkus.org>
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 * Specs available on the matroska project page:
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 * http://www.matroska.org/.
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 */
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#include "avformat.h"
32
/* For codec_get_id(). */
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#include "riff.h"
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#include "intfloat_readwrite.h"
35

    
36
/* EBML version supported */
37
#define EBML_VERSION 1
38

    
39
/* top-level master-IDs */
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#define EBML_ID_HEADER             0x1A45DFA3
41

    
42
/* IDs in the HEADER master */
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#define EBML_ID_EBMLVERSION        0x4286
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#define EBML_ID_EBMLREADVERSION    0x42F7
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#define EBML_ID_EBMLMAXIDLENGTH    0x42F2
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#define EBML_ID_EBMLMAXSIZELENGTH  0x42F3
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#define EBML_ID_DOCTYPE            0x4282
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#define EBML_ID_DOCTYPEVERSION     0x4287
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#define EBML_ID_DOCTYPEREADVERSION 0x4285
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/* general EBML types */
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#define EBML_ID_VOID               0xEC
53

    
54
/*
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 * Matroska element IDs. max. 32-bit.
56
 */
57

    
58
/* toplevel segment */
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#define MATROSKA_ID_SEGMENT    0x18538067
60

    
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/* matroska top-level master IDs */
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#define MATROSKA_ID_INFO       0x1549A966
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#define MATROSKA_ID_TRACKS     0x1654AE6B
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#define MATROSKA_ID_CUES       0x1C53BB6B
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#define MATROSKA_ID_TAGS       0x1254C367
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#define MATROSKA_ID_SEEKHEAD   0x114D9B74
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#define MATROSKA_ID_CLUSTER    0x1F43B675
68

    
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/* IDs in the info master */
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#define MATROSKA_ID_TIMECODESCALE 0x2AD7B1
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#define MATROSKA_ID_DURATION   0x4489
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#define MATROSKA_ID_TITLE      0x7BA9
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#define MATROSKA_ID_WRITINGAPP 0x5741
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#define MATROSKA_ID_MUXINGAPP  0x4D80
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#define MATROSKA_ID_DATEUTC    0x4461
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77
/* ID in the tracks master */
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#define MATROSKA_ID_TRACKENTRY 0xAE
79

    
80
/* IDs in the trackentry master */
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#define MATROSKA_ID_TRACKNUMBER 0xD7
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#define MATROSKA_ID_TRACKUID   0x73C5
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#define MATROSKA_ID_TRACKTYPE  0x83
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#define MATROSKA_ID_TRACKAUDIO 0xE1
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#define MATROSKA_ID_TRACKVIDEO 0xE0
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#define MATROSKA_ID_CODECID    0x86
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#define MATROSKA_ID_CODECPRIVATE 0x63A2
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#define MATROSKA_ID_CODECNAME  0x258688
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#define MATROSKA_ID_CODECINFOURL 0x3B4040
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#define MATROSKA_ID_CODECDOWNLOADURL 0x26B240
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#define MATROSKA_ID_TRACKNAME  0x536E
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#define MATROSKA_ID_TRACKLANGUAGE 0x22B59C
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#define MATROSKA_ID_TRACKFLAGENABLED 0xB9
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#define MATROSKA_ID_TRACKFLAGDEFAULT 0x88
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#define MATROSKA_ID_TRACKFLAGLACING 0x9C
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#define MATROSKA_ID_TRACKMINCACHE 0x6DE7
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#define MATROSKA_ID_TRACKMAXCACHE 0x6DF8
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#define MATROSKA_ID_TRACKDEFAULTDURATION 0x23E383
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100
/* IDs in the trackvideo master */
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#define MATROSKA_ID_VIDEOFRAMERATE 0x2383E3
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#define MATROSKA_ID_VIDEODISPLAYWIDTH 0x54B0
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#define MATROSKA_ID_VIDEODISPLAYHEIGHT 0x54BA
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#define MATROSKA_ID_VIDEOPIXELWIDTH 0xB0
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#define MATROSKA_ID_VIDEOPIXELHEIGHT 0xBA
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#define MATROSKA_ID_VIDEOFLAGINTERLACED 0x9A
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#define MATROSKA_ID_VIDEOSTEREOMODE 0x53B9
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#define MATROSKA_ID_VIDEOASPECTRATIO 0x54B3
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#define MATROSKA_ID_VIDEOCOLOURSPACE 0x2EB524
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/* IDs in the trackaudio master */
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#define MATROSKA_ID_AUDIOSAMPLINGFREQ 0xB5
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#define MATROSKA_ID_AUDIOOUTSAMPLINGFREQ 0x78B5
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#define MATROSKA_ID_AUDIOBITDEPTH 0x6264
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#define MATROSKA_ID_AUDIOCHANNELS 0x9F
117

    
118
/* ID in the cues master */
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#define MATROSKA_ID_POINTENTRY 0xBB
120

    
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/* IDs in the pointentry master */
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#define MATROSKA_ID_CUETIME    0xB3
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#define MATROSKA_ID_CUETRACKPOSITION 0xB7
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125
/* IDs in the cuetrackposition master */
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#define MATROSKA_ID_CUETRACK   0xF7
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#define MATROSKA_ID_CUECLUSTERPOSITION 0xF1
128

    
129
/* IDs in the tags master */
130
/* TODO */
131

    
132
/* IDs in the seekhead master */
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#define MATROSKA_ID_SEEKENTRY  0x4DBB
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135
/* IDs in the seekpoint master */
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#define MATROSKA_ID_SEEKID     0x53AB
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#define MATROSKA_ID_SEEKPOSITION 0x53AC
138

    
139
/* IDs in the cluster master */
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#define MATROSKA_ID_CLUSTERTIMECODE 0xE7
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#define MATROSKA_ID_BLOCKGROUP 0xA0
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#define MATROSKA_ID_SIMPLEBLOCK 0xA3
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144
/* IDs in the blockgroup master */
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#define MATROSKA_ID_BLOCK      0xA1
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#define MATROSKA_ID_BLOCKDURATION 0x9B
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#define MATROSKA_ID_BLOCKREFERENCE 0xFB
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149
typedef enum {
150
  MATROSKA_TRACK_TYPE_VIDEO    = 0x1,
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  MATROSKA_TRACK_TYPE_AUDIO    = 0x2,
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  MATROSKA_TRACK_TYPE_COMPLEX  = 0x3,
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  MATROSKA_TRACK_TYPE_LOGO     = 0x10,
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  MATROSKA_TRACK_TYPE_SUBTITLE = 0x11,
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  MATROSKA_TRACK_TYPE_CONTROL  = 0x20,
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} MatroskaTrackType;
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158
typedef enum {
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  MATROSKA_EYE_MODE_MONO  = 0x0,
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  MATROSKA_EYE_MODE_RIGHT = 0x1,
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  MATROSKA_EYE_MODE_LEFT  = 0x2,
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  MATROSKA_EYE_MODE_BOTH  = 0x3,
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} MatroskaEyeMode;
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165
typedef enum {
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  MATROSKA_ASPECT_RATIO_MODE_FREE  = 0x0,
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  MATROSKA_ASPECT_RATIO_MODE_KEEP  = 0x1,
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  MATROSKA_ASPECT_RATIO_MODE_FIXED = 0x2,
169
} MatroskaAspectRatioMode;
170

    
171
/*
172
 * These aren't in any way "matroska-form" things,
173
 * it's just something I use in the muxer/demuxer.
174
 */
175

    
176
typedef enum {
177
  MATROSKA_TRACK_ENABLED = (1<<0),
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  MATROSKA_TRACK_DEFAULT = (1<<1),
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  MATROSKA_TRACK_LACING  = (1<<2),
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  MATROSKA_TRACK_REAL_V  = (1<<4),
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  MATROSKA_TRACK_SHIFT   = (1<<16)
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} MatroskaTrackFlags;
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184
typedef enum {
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  MATROSKA_VIDEOTRACK_INTERLACED = (MATROSKA_TRACK_SHIFT<<0)
186
} MatroskaVideoTrackFlags;
187

    
188
/*
189
 * Matroska Codec IDs. Strings.
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 */
191

    
192
typedef struct CodecTags{
193
    const char *str;
194
    enum CodecID id;
195
}CodecTags;
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197
#define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC   "V_MS/VFW/FOURCC"
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#define MATROSKA_CODEC_ID_AUDIO_ACM          "A_MS/ACM"
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200
static CodecTags codec_tags[]={
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//    {"V_MS/VFW/FOURCC"  , CODEC_ID_NONE},
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    {"V_UNCOMPRESSED"   , CODEC_ID_RAWVIDEO},
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    {"V_MPEG4/ISO/SP"   , CODEC_ID_MPEG4},
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    {"V_MPEG4/ISO/ASP"  , CODEC_ID_MPEG4},
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    {"V_MPEG4/ISO/AP"   , CODEC_ID_MPEG4},
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    {"V_MPEG4/ISO/AVC"  , CODEC_ID_H264},
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    {"V_MPEG4/MS/V3"    , CODEC_ID_MSMPEG4V3},
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    {"V_MPEG1"          , CODEC_ID_MPEG1VIDEO},
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    {"V_MPEG2"          , CODEC_ID_MPEG2VIDEO},
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    {"V_MJPEG"          , CODEC_ID_MJPEG},
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    {"V_REAL/RV10"      , CODEC_ID_RV10},
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    {"V_REAL/RV20"      , CODEC_ID_RV20},
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    {"V_REAL/RV30"      , CODEC_ID_RV30},
214
    {"V_REAL/RV40"      , CODEC_ID_RV40},
215
    {"V_THEORA"         , CODEC_ID_THEORA},
216
/* TODO: Real/Quicktime */
217

    
218
//    {"A_MS/ACM"         , CODEC_ID_NONE},
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    {"A_MPEG/L1"        , CODEC_ID_MP3},
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    {"A_MPEG/L2"        , CODEC_ID_MP3},
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    {"A_MPEG/L3"        , CODEC_ID_MP3},
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    {"A_PCM/INT/BIG"    , CODEC_ID_PCM_U16BE},
223
    {"A_PCM/INT/LIT"    , CODEC_ID_PCM_U16LE},
224
//    {"A_PCM/FLOAT/IEEE" , CODEC_ID_NONE},
225
    {"A_AC3"            , CODEC_ID_AC3},
226
    {"A_DTS"            , CODEC_ID_DTS},
227
    {"A_VORBIS"         , CODEC_ID_VORBIS},
228
    {"A_AAC"            , CODEC_ID_AAC},
229
    {"A_FLAC"           , CODEC_ID_FLAC},
230
    {"A_WAVPACK4"       , CODEC_ID_WAVPACK},
231
    {"A_TTA1"           , CODEC_ID_TTA},
232
    {NULL               , CODEC_ID_NONE}
233
/* TODO: AC3-9/10 (?), Real, Musepack, Quicktime */
234
};
235

    
236
/* max. depth in the EBML tree structure */
237
#define EBML_MAX_DEPTH 16
238

    
239
typedef struct Track {
240
    MatroskaTrackType type;
241

    
242
    /* Unique track number and track ID. stream_index is the index that
243
     * the calling app uses for this track. */
244
    uint32_t num,
245
        uid,
246
        stream_index;
247

    
248
    char *name,
249
        *language;
250

    
251
    char *codec_id,
252
        *codec_name;
253

    
254
    unsigned char *codec_priv;
255
    int codec_priv_size;
256

    
257
    uint64_t default_duration;
258
    MatroskaTrackFlags flags;
259
} MatroskaTrack;
260

    
261
typedef struct MatroskaVideoTrack {
262
    MatroskaTrack track;
263

    
264
    int pixel_width,
265
        pixel_height,
266
        display_width,
267
        display_height;
268

    
269
    uint32_t fourcc;
270

    
271
    MatroskaAspectRatioMode ar_mode;
272
    MatroskaEyeMode eye_mode;
273

    
274
    //..
275
} MatroskaVideoTrack;
276

    
277
typedef struct MatroskaAudioTrack {
278
    MatroskaTrack track;
279

    
280
    int channels,
281
        bitdepth,
282
        internal_samplerate,
283
        samplerate;
284
    //..
285
} MatroskaAudioTrack;
286

    
287
typedef struct MatroskaSubtitleTrack {
288
    MatroskaTrack track;
289

    
290
    //..
291
} MatroskaSubtitleTrack;
292

    
293
#define MAX_TRACK_SIZE (FFMAX(FFMAX(sizeof(MatroskaVideoTrack), \
294
                                    sizeof(MatroskaAudioTrack)), \
295
                                    sizeof(MatroskaSubtitleTrack)))
296

    
297
typedef struct MatroskaLevel {
298
    uint64_t start, length;
299
} MatroskaLevel;
300

    
301
typedef struct MatroskaDemuxIndex {
302
  uint64_t        pos;   /* of the corresponding *cluster*! */
303
  uint16_t        track; /* reference to 'num' */
304
  uint64_t        time;  /* in nanoseconds */
305
} MatroskaDemuxIndex;
306

    
307
typedef struct MatroskaDemuxContext {
308
    AVFormatContext *ctx;
309

    
310
    /* ebml stuff */
311
    int num_levels;
312
    MatroskaLevel levels[EBML_MAX_DEPTH];
313
    int level_up;
314

    
315
    /* matroska stuff */
316
    char *writing_app,
317
        *muxing_app;
318
    int64_t created;
319

    
320
    /* timescale in the file */
321
    int64_t time_scale;
322

    
323
    /* num_streams is the number of streams that av_new_stream() was called
324
     * for ( = that are available to the calling program). */
325
    int num_tracks, num_streams;
326
    MatroskaTrack *tracks[MAX_STREAMS];
327

    
328
    /* cache for ID peeking */
329
    uint32_t peek_id;
330

    
331
    /* byte position of the segment inside the stream */
332
    offset_t segment_start;
333

    
334
    /* The packet queue. */
335
    AVPacket **packets;
336
    int num_packets;
337

    
338
    /* have we already parse metadata/cues/clusters? */
339
    int metadata_parsed,
340
        index_parsed,
341
        done;
342

    
343
    /* The index for seeking. */
344
    int num_indexes;
345
    MatroskaDemuxIndex *index;
346
} MatroskaDemuxContext;
347

    
348
/*
349
 * The first few functions handle EBML file parsing. The rest
350
 * is the document interpretation. Matroska really just is a
351
 * EBML file.
352
 */
353

    
354
/*
355
 * Return: the amount of levels in the hierarchy that the
356
 * current element lies higher than the previous one.
357
 * The opposite isn't done - that's auto-done using master
358
 * element reading.
359
 */
360

    
361
static int
362
ebml_read_element_level_up (MatroskaDemuxContext *matroska)
363
{
364
    ByteIOContext *pb = &matroska->ctx->pb;
365
    offset_t pos = url_ftell(pb);
366
    int num = 0;
367

    
368
    while (matroska->num_levels > 0) {
369
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
370

    
371
        if (pos >= level->start + level->length) {
372
            matroska->num_levels--;
373
            num++;
374
        } else {
375
            break;
376
        }
377
    }
378

    
379
    return num;
380
}
381

    
382
/*
383
 * Read: an "EBML number", which is defined as a variable-length
384
 * array of bytes. The first byte indicates the length by giving a
385
 * number of 0-bits followed by a one. The position of the first
386
 * "one" bit inside the first byte indicates the length of this
387
 * number.
388
 * Returns: num. of bytes read. < 0 on error.
389
 */
390

    
391
static int
392
ebml_read_num (MatroskaDemuxContext *matroska,
393
               int                   max_size,
394
               uint64_t             *number)
395
{
396
    ByteIOContext *pb = &matroska->ctx->pb;
397
    int len_mask = 0x80, read = 1, n = 1;
398
    int64_t total = 0;
399

    
400
    /* the first byte tells us the length in bytes - get_byte() can normally
401
     * return 0, but since that's not a valid first ebmlID byte, we can
402
     * use it safely here to catch EOS. */
403
    if (!(total = get_byte(pb))) {
404
        /* we might encounter EOS here */
405
        if (!url_feof(pb)) {
406
            offset_t pos = url_ftell(pb);
407
            av_log(matroska->ctx, AV_LOG_ERROR,
408
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
409
                   pos, pos);
410
        }
411
        return AVERROR_IO; /* EOS or actual I/O error */
412
    }
413

    
414
    /* get the length of the EBML number */
415
    while (read <= max_size && !(total & len_mask)) {
416
        read++;
417
        len_mask >>= 1;
418
    }
419
    if (read > max_size) {
420
        offset_t pos = url_ftell(pb) - 1;
421
        av_log(matroska->ctx, AV_LOG_ERROR,
422
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
423
               (uint8_t) total, pos, pos);
424
        return AVERROR_INVALIDDATA;
425
    }
426

    
427
    /* read out length */
428
    total &= ~len_mask;
429
    while (n++ < read)
430
        total = (total << 8) | get_byte(pb);
431

    
432
    *number = total;
433

    
434
    return read;
435
}
436

    
437
/*
438
 * Read: the element content data ID.
439
 * Return: the number of bytes read or < 0 on error.
440
 */
441

    
442
static int
443
ebml_read_element_id (MatroskaDemuxContext *matroska,
444
                      uint32_t             *id,
445
                      int                  *level_up)
446
{
447
    int read;
448
    uint64_t total;
449

    
450
    /* if we re-call this, use our cached ID */
451
    if (matroska->peek_id != 0) {
452
        if (level_up)
453
            *level_up = 0;
454
        *id = matroska->peek_id;
455
        return 0;
456
    }
457

    
458
    /* read out the "EBML number", include tag in ID */
459
    if ((read = ebml_read_num(matroska, 4, &total)) < 0)
460
        return read;
461
    *id = matroska->peek_id  = total | (1 << (read * 7));
462

    
463
    /* level tracking */
464
    if (level_up)
465
        *level_up = ebml_read_element_level_up(matroska);
466

    
467
    return read;
468
}
469

    
470
/*
471
 * Read: element content length.
472
 * Return: the number of bytes read or < 0 on error.
473
 */
474

    
475
static int
476
ebml_read_element_length (MatroskaDemuxContext *matroska,
477
                          uint64_t             *length)
478
{
479
    /* clear cache since we're now beyond that data point */
480
    matroska->peek_id = 0;
481

    
482
    /* read out the "EBML number", include tag in ID */
483
    return ebml_read_num(matroska, 8, length);
484
}
485

    
486
/*
487
 * Return: the ID of the next element, or 0 on error.
488
 * Level_up contains the amount of levels that this
489
 * next element lies higher than the previous one.
490
 */
491

    
492
static uint32_t
493
ebml_peek_id (MatroskaDemuxContext *matroska,
494
              int                  *level_up)
495
{
496
    uint32_t id;
497

    
498
    assert(level_up != NULL);
499

    
500
    if (ebml_read_element_id(matroska, &id, level_up) < 0)
501
        return 0;
502

    
503
    return id;
504
}
505

    
506
/*
507
 * Seek to a given offset.
508
 * 0 is success, -1 is failure.
509
 */
510

    
511
static int
512
ebml_read_seek (MatroskaDemuxContext *matroska,
513
                offset_t              offset)
514
{
515
    ByteIOContext *pb = &matroska->ctx->pb;
516

    
517
    /* clear ID cache, if any */
518
    matroska->peek_id = 0;
519

    
520
    return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
521
}
522

    
523
/*
524
 * Skip the next element.
525
 * 0 is success, -1 is failure.
526
 */
527

    
528
static int
529
ebml_read_skip (MatroskaDemuxContext *matroska)
530
{
531
    ByteIOContext *pb = &matroska->ctx->pb;
532
    uint32_t id;
533
    uint64_t length;
534
    int res;
535

    
536
    if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
537
        (res = ebml_read_element_length(matroska, &length)) < 0)
538
        return res;
539

    
540
    url_fskip(pb, length);
541

    
542
    return 0;
543
}
544

    
545
/*
546
 * Read the next element as an unsigned int.
547
 * 0 is success, < 0 is failure.
548
 */
549

    
550
static int
551
ebml_read_uint (MatroskaDemuxContext *matroska,
552
                uint32_t             *id,
553
                uint64_t             *num)
554
{
555
    ByteIOContext *pb = &matroska->ctx->pb;
556
    int n = 0, size, res;
557
    uint64_t rlength;
558

    
559
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
560
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
561
        return res;
562
    size = rlength;
563
    if (size < 1 || size > 8) {
564
        offset_t pos = url_ftell(pb);
565
        av_log(matroska->ctx, AV_LOG_ERROR,
566
               "Invalid uint element size %d at position %"PRId64" (0x%"PRIx64")\n",
567
                size, pos, pos);
568
        return AVERROR_INVALIDDATA;
569
    }
570

    
571
    /* big-endian ordening; build up number */
572
    *num = 0;
573
    while (n++ < size)
574
        *num = (*num << 8) | get_byte(pb);
575

    
576
    return 0;
577
}
578

    
579
/*
580
 * Read the next element as a signed int.
581
 * 0 is success, < 0 is failure.
582
 */
583

    
584
static int
585
ebml_read_sint (MatroskaDemuxContext *matroska,
586
                uint32_t             *id,
587
                int64_t              *num)
588
{
589
    ByteIOContext *pb = &matroska->ctx->pb;
590
    int size, n = 1, negative = 0, res;
591
    uint64_t rlength;
592

    
593
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
594
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
595
        return res;
596
    size = rlength;
597
    if (size < 1 || size > 8) {
598
        offset_t pos = url_ftell(pb);
599
        av_log(matroska->ctx, AV_LOG_ERROR,
600
               "Invalid sint element size %d at position %"PRId64" (0x%"PRIx64")\n",
601
                size, pos, pos);
602
        return AVERROR_INVALIDDATA;
603
    }
604
    if ((*num = get_byte(pb)) & 0x80) {
605
        negative = 1;
606
        *num &= ~0x80;
607
    }
608
    while (n++ < size)
609
        *num = (*num << 8) | get_byte(pb);
610

    
611
    /* make signed */
612
    if (negative)
613
        *num = *num - (1LL << ((8 * size) - 1));
614

    
615
    return 0;
616
}
617

    
618
/*
619
 * Read the next element as a float.
620
 * 0 is success, < 0 is failure.
621
 */
622

    
623
static int
624
ebml_read_float (MatroskaDemuxContext *matroska,
625
                 uint32_t             *id,
626
                 double               *num)
627
{
628
    ByteIOContext *pb = &matroska->ctx->pb;
629
    int size, res;
630
    uint64_t rlength;
631

    
632
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
633
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
634
        return res;
635
    size = rlength;
636

    
637
    if (size == 4) {
638
        *num= av_int2flt(get_be32(pb));
639
    } else if(size==8){
640
        *num= av_int2dbl(get_be64(pb));
641
    } else{
642
        offset_t pos = url_ftell(pb);
643
        av_log(matroska->ctx, AV_LOG_ERROR,
644
               "Invalid float element size %d at position %"PRIu64" (0x%"PRIx64")\n",
645
               size, pos, pos);
646
        return AVERROR_INVALIDDATA;
647
    }
648

    
649
    return 0;
650
}
651

    
652
/*
653
 * Read the next element as an ASCII string.
654
 * 0 is success, < 0 is failure.
655
 */
656

    
657
static int
658
ebml_read_ascii (MatroskaDemuxContext *matroska,
659
                 uint32_t             *id,
660
                 char                **str)
661
{
662
    ByteIOContext *pb = &matroska->ctx->pb;
663
    int size, res;
664
    uint64_t rlength;
665

    
666
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
667
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
668
        return res;
669
    size = rlength;
670

    
671
    /* ebml strings are usually not 0-terminated, so we allocate one
672
     * byte more, read the string and NULL-terminate it ourselves. */
673
    if (size < 0 || !(*str = av_malloc(size + 1))) {
674
        av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
675
        return AVERROR_NOMEM;
676
    }
677
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
678
        offset_t pos = url_ftell(pb);
679
        av_log(matroska->ctx, AV_LOG_ERROR,
680
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
681
        return AVERROR_IO;
682
    }
683
    (*str)[size] = '\0';
684

    
685
    return 0;
686
}
687

    
688
/*
689
 * Read the next element as a UTF-8 string.
690
 * 0 is success, < 0 is failure.
691
 */
692

    
693
static int
694
ebml_read_utf8 (MatroskaDemuxContext *matroska,
695
                uint32_t             *id,
696
                char                **str)
697
{
698
  return ebml_read_ascii(matroska, id, str);
699
}
700

    
701
/*
702
 * Read the next element as a date (nanoseconds since 1/1/2000).
703
 * 0 is success, < 0 is failure.
704
 */
705

    
706
static int
707
ebml_read_date (MatroskaDemuxContext *matroska,
708
                uint32_t             *id,
709
                int64_t              *date)
710
{
711
  return ebml_read_sint(matroska, id, date);
712
}
713

    
714
/*
715
 * Read the next element, but only the header. The contents
716
 * are supposed to be sub-elements which can be read separately.
717
 * 0 is success, < 0 is failure.
718
 */
719

    
720
static int
721
ebml_read_master (MatroskaDemuxContext *matroska,
722
                  uint32_t             *id)
723
{
724
    ByteIOContext *pb = &matroska->ctx->pb;
725
    uint64_t length;
726
    MatroskaLevel *level;
727
    int res;
728

    
729
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
730
        (res = ebml_read_element_length(matroska, &length)) < 0)
731
        return res;
732

    
733
    /* protect... (Heaven forbids that the '>' is true) */
734
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
735
        av_log(matroska->ctx, AV_LOG_ERROR,
736
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
737
        return AVERROR_NOTSUPP;
738
    }
739

    
740
    /* remember level */
741
    level = &matroska->levels[matroska->num_levels++];
742
    level->start = url_ftell(pb);
743
    level->length = length;
744

    
745
    return 0;
746
}
747

    
748
/*
749
 * Read the next element as binary data.
750
 * 0 is success, < 0 is failure.
751
 */
752

    
753
static int
754
ebml_read_binary (MatroskaDemuxContext *matroska,
755
                  uint32_t             *id,
756
                  uint8_t             **binary,
757
                  int                  *size)
758
{
759
    ByteIOContext *pb = &matroska->ctx->pb;
760
    uint64_t rlength;
761
    int res;
762

    
763
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
764
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
765
        return res;
766
    *size = rlength;
767

    
768
    if (!(*binary = av_malloc(*size))) {
769
        av_log(matroska->ctx, AV_LOG_ERROR,
770
               "Memory allocation error\n");
771
        return AVERROR_NOMEM;
772
    }
773

    
774
    if (get_buffer(pb, *binary, *size) != *size) {
775
        offset_t pos = url_ftell(pb);
776
        av_log(matroska->ctx, AV_LOG_ERROR,
777
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
778
        return AVERROR_IO;
779
    }
780

    
781
    return 0;
782
}
783

    
784
/*
785
 * Read signed/unsigned "EBML" numbers.
786
 * Return: number of bytes processed, < 0 on error.
787
 * XXX: use ebml_read_num().
788
 */
789

    
790
static int
791
matroska_ebmlnum_uint (uint8_t  *data,
792
                       uint32_t  size,
793
                       uint64_t *num)
794
{
795
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
796
    uint64_t total;
797

    
798
    if (size <= 0)
799
        return AVERROR_INVALIDDATA;
800

    
801
    total = data[0];
802
    while (read <= 8 && !(total & len_mask)) {
803
        read++;
804
        len_mask >>= 1;
805
    }
806
    if (read > 8)
807
        return AVERROR_INVALIDDATA;
808

    
809
    if ((total &= (len_mask - 1)) == len_mask - 1)
810
        num_ffs++;
811
    if (size < read)
812
        return AVERROR_INVALIDDATA;
813
    while (n < read) {
814
        if (data[n] == 0xff)
815
            num_ffs++;
816
        total = (total << 8) | data[n];
817
        n++;
818
    }
819

    
820
    if (read == num_ffs)
821
        *num = (uint64_t)-1;
822
    else
823
        *num = total;
824

    
825
    return read;
826
}
827

    
828
/*
829
 * Same as above, but signed.
830
 */
831

    
832
static int
833
matroska_ebmlnum_sint (uint8_t  *data,
834
                       uint32_t  size,
835
                       int64_t  *num)
836
{
837
    uint64_t unum;
838
    int res;
839

    
840
    /* read as unsigned number first */
841
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
842
        return res;
843

    
844
    /* make signed (weird way) */
845
    if (unum == (uint64_t)-1)
846
        *num = INT64_MAX;
847
    else
848
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
849

    
850
    return res;
851
}
852

    
853
/*
854
 * Read an EBML header.
855
 * 0 is success, < 0 is failure.
856
 */
857

    
858
static int
859
ebml_read_header (MatroskaDemuxContext *matroska,
860
                  char                **doctype,
861
                  int                  *version)
862
{
863
    uint32_t id;
864
    int level_up, res = 0;
865

    
866
    /* default init */
867
    if (doctype)
868
        *doctype = NULL;
869
    if (version)
870
        *version = 1;
871

    
872
    if (!(id = ebml_peek_id(matroska, &level_up)) ||
873
        level_up != 0 || id != EBML_ID_HEADER) {
874
        av_log(matroska->ctx, AV_LOG_ERROR,
875
               "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
876
        return AVERROR_INVALIDDATA;
877
    }
878
    if ((res = ebml_read_master(matroska, &id)) < 0)
879
        return res;
880

    
881
    while (res == 0) {
882
        if (!(id = ebml_peek_id(matroska, &level_up)))
883
            return AVERROR_IO;
884

    
885
        /* end-of-header */
886
        if (level_up)
887
            break;
888

    
889
        switch (id) {
890
            /* is our read version uptodate? */
891
            case EBML_ID_EBMLREADVERSION: {
892
                uint64_t num;
893

    
894
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
895
                    return res;
896
                if (num > EBML_VERSION) {
897
                    av_log(matroska->ctx, AV_LOG_ERROR,
898
                           "EBML version %"PRIu64" (> %d) is not supported\n",
899
                           num, EBML_VERSION);
900
                    return AVERROR_INVALIDDATA;
901
                }
902
                break;
903
            }
904

    
905
            /* we only handle 8 byte lengths at max */
906
            case EBML_ID_EBMLMAXSIZELENGTH: {
907
                uint64_t num;
908

    
909
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
910
                    return res;
911
                if (num > sizeof(uint64_t)) {
912
                    av_log(matroska->ctx, AV_LOG_ERROR,
913
                           "Integers of size %"PRIu64" (> %zd) not supported\n",
914
                           num, sizeof(uint64_t));
915
                    return AVERROR_INVALIDDATA;
916
                }
917
                break;
918
            }
919

    
920
            /* we handle 4 byte IDs at max */
921
            case EBML_ID_EBMLMAXIDLENGTH: {
922
                uint64_t num;
923

    
924
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
925
                    return res;
926
                if (num > sizeof(uint32_t)) {
927
                    av_log(matroska->ctx, AV_LOG_ERROR,
928
                           "IDs of size %"PRIu64" (> %zu) not supported\n",
929
                            num, sizeof(uint32_t));
930
                    return AVERROR_INVALIDDATA;
931
                }
932
                break;
933
            }
934

    
935
            case EBML_ID_DOCTYPE: {
936
                char *text;
937

    
938
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
939
                    return res;
940
                if (doctype) {
941
                    if (*doctype)
942
                        av_free(*doctype);
943
                    *doctype = text;
944
                } else
945
                    av_free(text);
946
                break;
947
            }
948

    
949
            case EBML_ID_DOCTYPEREADVERSION: {
950
                uint64_t num;
951

    
952
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
953
                    return res;
954
                if (version)
955
                    *version = num;
956
                break;
957
            }
958

    
959
            default:
960
                av_log(matroska->ctx, AV_LOG_INFO,
961
                       "Unknown data type 0x%x in EBML header", id);
962
                /* pass-through */
963

    
964
            case EBML_ID_VOID:
965
            /* we ignore these two, as they don't tell us anything we
966
             * care about */
967
            case EBML_ID_EBMLVERSION:
968
            case EBML_ID_DOCTYPEVERSION:
969
                res = ebml_read_skip (matroska);
970
                break;
971
        }
972
    }
973

    
974
    return 0;
975
}
976

    
977

    
978
static int
979
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
980
                            int                   num)
981
{
982
    int i;
983

    
984
    for (i = 0; i < matroska->num_tracks; i++)
985
        if (matroska->tracks[i]->num == num)
986
            return i;
987

    
988
    return -1;
989
}
990

    
991

    
992
/*
993
 * Put one packet in an application-supplied AVPacket struct.
994
 * Returns 0 on success or -1 on failure.
995
 */
996

    
997
static int
998
matroska_deliver_packet (MatroskaDemuxContext *matroska,
999
                         AVPacket             *pkt)
1000
{
1001
    if (matroska->num_packets > 0) {
1002
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1003
        av_free(matroska->packets[0]);
1004
        if (matroska->num_packets > 1) {
1005
            memmove(&matroska->packets[0], &matroska->packets[1],
1006
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
1007
            matroska->packets =
1008
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
1009
                           sizeof(AVPacket *));
1010
        } else {
1011
            av_freep(&matroska->packets);
1012
        }
1013
        matroska->num_packets--;
1014
        return 0;
1015
    }
1016

    
1017
    return -1;
1018
}
1019

    
1020
/*
1021
 * Put a packet into our internal queue. Will be delivered to the
1022
 * user/application during the next get_packet() call.
1023
 */
1024

    
1025
static void
1026
matroska_queue_packet (MatroskaDemuxContext *matroska,
1027
                       AVPacket             *pkt)
1028
{
1029
    matroska->packets =
1030
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
1031
                   sizeof(AVPacket *));
1032
    matroska->packets[matroska->num_packets] = pkt;
1033
    matroska->num_packets++;
1034
}
1035

    
1036

    
1037
/*
1038
 * Autodetecting...
1039
 */
1040

    
1041
static int
1042
matroska_probe (AVProbeData *p)
1043
{
1044
    uint64_t total = 0;
1045
    int len_mask = 0x80, size = 1, n = 1;
1046
    uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
1047

    
1048
    /* ebml header? */
1049
    if ((p->buf[0] << 24 | p->buf[1] << 16 |
1050
         p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
1051
        return 0;
1052

    
1053
    /* length of header */
1054
    total = p->buf[4];
1055
    while (size <= 8 && !(total & len_mask)) {
1056
        size++;
1057
        len_mask >>= 1;
1058
    }
1059
    if (size > 8)
1060
      return 0;
1061
    total &= (len_mask - 1);
1062
    while (n < size)
1063
        total = (total << 8) | p->buf[4 + n++];
1064

    
1065
    /* does the probe data contain the whole header? */
1066
    if (p->buf_size < 4 + size + total)
1067
      return 0;
1068

    
1069
    /* the header must contain the document type 'matroska'. For now,
1070
     * we don't parse the whole header but simply check for the
1071
     * availability of that array of characters inside the header.
1072
     * Not fully fool-proof, but good enough. */
1073
    for (n = 4 + size; n <= 4 + size + total - sizeof(probe_data); n++)
1074
        if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
1075
            return AVPROBE_SCORE_MAX;
1076

    
1077
    return 0;
1078
}
1079

    
1080
/*
1081
 * From here on, it's all XML-style DTD stuff... Needs no comments.
1082
 */
1083

    
1084
static int
1085
matroska_parse_info (MatroskaDemuxContext *matroska)
1086
{
1087
    int res = 0;
1088
    uint32_t id;
1089

    
1090
    av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
1091

    
1092
    while (res == 0) {
1093
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1094
            res = AVERROR_IO;
1095
            break;
1096
        } else if (matroska->level_up) {
1097
            matroska->level_up--;
1098
            break;
1099
        }
1100

    
1101
        switch (id) {
1102
            /* cluster timecode */
1103
            case MATROSKA_ID_TIMECODESCALE: {
1104
                uint64_t num;
1105
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1106
                    break;
1107
                matroska->time_scale = num;
1108
                break;
1109
            }
1110

    
1111
            case MATROSKA_ID_DURATION: {
1112
                double num;
1113
                if ((res = ebml_read_float(matroska, &id, &num)) < 0)
1114
                    break;
1115
                matroska->ctx->duration = num * matroska->time_scale * 1000 / AV_TIME_BASE;
1116
                break;
1117
            }
1118

    
1119
            case MATROSKA_ID_TITLE: {
1120
                char *text;
1121
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1122
                    break;
1123
                strncpy(matroska->ctx->title, text,
1124
                        sizeof(matroska->ctx->title)-1);
1125
                av_free(text);
1126
                break;
1127
            }
1128

    
1129
            case MATROSKA_ID_WRITINGAPP: {
1130
                char *text;
1131
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1132
                    break;
1133
                matroska->writing_app = text;
1134
                break;
1135
            }
1136

    
1137
            case MATROSKA_ID_MUXINGAPP: {
1138
                char *text;
1139
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1140
                    break;
1141
                matroska->muxing_app = text;
1142
                break;
1143
            }
1144

    
1145
            case MATROSKA_ID_DATEUTC: {
1146
                int64_t time;
1147
                if ((res = ebml_read_date(matroska, &id, &time)) < 0)
1148
                    break;
1149
                matroska->created = time;
1150
                break;
1151
            }
1152

    
1153
            default:
1154
                av_log(matroska->ctx, AV_LOG_INFO,
1155
                       "Unknown entry 0x%x in info header\n", id);
1156
                /* fall-through */
1157

    
1158
            case EBML_ID_VOID:
1159
                res = ebml_read_skip(matroska);
1160
                break;
1161
        }
1162

    
1163
        if (matroska->level_up) {
1164
            matroska->level_up--;
1165
            break;
1166
        }
1167
    }
1168

    
1169
    return res;
1170
}
1171

    
1172
static int
1173
matroska_add_stream (MatroskaDemuxContext *matroska)
1174
{
1175
    int res = 0;
1176
    uint32_t id;
1177
    MatroskaTrack *track;
1178

    
1179
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
1180

    
1181
    /* Allocate a generic track. As soon as we know its type we'll realloc. */
1182
    track = av_mallocz(MAX_TRACK_SIZE);
1183
    matroska->num_tracks++;
1184

    
1185
    /* start with the master */
1186
    if ((res = ebml_read_master(matroska, &id)) < 0)
1187
        return res;
1188

    
1189
    /* try reading the trackentry headers */
1190
    while (res == 0) {
1191
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1192
            res = AVERROR_IO;
1193
            break;
1194
        } else if (matroska->level_up > 0) {
1195
            matroska->level_up--;
1196
            break;
1197
        }
1198

    
1199
        switch (id) {
1200
            /* track number (unique stream ID) */
1201
            case MATROSKA_ID_TRACKNUMBER: {
1202
                uint64_t num;
1203
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1204
                    break;
1205
                track->num = num;
1206
                break;
1207
            }
1208

    
1209
            /* track UID (unique identifier) */
1210
            case MATROSKA_ID_TRACKUID: {
1211
                uint64_t num;
1212
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1213
                    break;
1214
                track->uid = num;
1215
                break;
1216
            }
1217

    
1218
            /* track type (video, audio, combined, subtitle, etc.) */
1219
            case MATROSKA_ID_TRACKTYPE: {
1220
                uint64_t num;
1221
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1222
                    break;
1223
                if (track->type && track->type != num) {
1224
                    av_log(matroska->ctx, AV_LOG_INFO,
1225
                           "More than one tracktype in an entry - skip\n");
1226
                    break;
1227
                }
1228
                track->type = num;
1229

    
1230
                switch (track->type) {
1231
                    case MATROSKA_TRACK_TYPE_VIDEO:
1232
                    case MATROSKA_TRACK_TYPE_AUDIO:
1233
                    case MATROSKA_TRACK_TYPE_SUBTITLE:
1234
                        break;
1235
                    case MATROSKA_TRACK_TYPE_COMPLEX:
1236
                    case MATROSKA_TRACK_TYPE_LOGO:
1237
                    case MATROSKA_TRACK_TYPE_CONTROL:
1238
                    default:
1239
                        av_log(matroska->ctx, AV_LOG_INFO,
1240
                               "Unknown or unsupported track type 0x%x\n",
1241
                               track->type);
1242
                        track->type = 0;
1243
                        break;
1244
                }
1245
                matroska->tracks[matroska->num_tracks - 1] = track;
1246
                break;
1247
            }
1248

    
1249
            /* tracktype specific stuff for video */
1250
            case MATROSKA_ID_TRACKVIDEO: {
1251
                MatroskaVideoTrack *videotrack;
1252
                if (!track->type)
1253
                    track->type = MATROSKA_TRACK_TYPE_VIDEO;
1254
                if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
1255
                    av_log(matroska->ctx, AV_LOG_INFO,
1256
                           "video data in non-video track - ignoring\n");
1257
                    res = AVERROR_INVALIDDATA;
1258
                    break;
1259
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1260
                    break;
1261
                videotrack = (MatroskaVideoTrack *)track;
1262

    
1263
                while (res == 0) {
1264
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1265
                        res = AVERROR_IO;
1266
                        break;
1267
                    } else if (matroska->level_up > 0) {
1268
                        matroska->level_up--;
1269
                        break;
1270
                    }
1271

    
1272
                    switch (id) {
1273
                        /* fixme, this should be one-up, but I get it here */
1274
                        case MATROSKA_ID_TRACKDEFAULTDURATION: {
1275
                            uint64_t num;
1276
                            if ((res = ebml_read_uint (matroska, &id,
1277
                                                       &num)) < 0)
1278
                                break;
1279
                            track->default_duration = num/matroska->time_scale;
1280
                            break;
1281
                        }
1282

    
1283
                        /* video framerate */
1284
                        case MATROSKA_ID_VIDEOFRAMERATE: {
1285
                            double num;
1286
                            if ((res = ebml_read_float(matroska, &id,
1287
                                                       &num)) < 0)
1288
                                break;
1289
                            track->default_duration = 1000000000/(matroska->time_scale*num);
1290
                            break;
1291
                        }
1292

    
1293
                        /* width of the size to display the video at */
1294
                        case MATROSKA_ID_VIDEODISPLAYWIDTH: {
1295
                            uint64_t num;
1296
                            if ((res = ebml_read_uint(matroska, &id,
1297
                                                      &num)) < 0)
1298
                                break;
1299
                            videotrack->display_width = num;
1300
                            break;
1301
                        }
1302

    
1303
                        /* height of the size to display the video at */
1304
                        case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
1305
                            uint64_t num;
1306
                            if ((res = ebml_read_uint(matroska, &id,
1307
                                                      &num)) < 0)
1308
                                break;
1309
                            videotrack->display_height = num;
1310
                            break;
1311
                        }
1312

    
1313
                        /* width of the video in the file */
1314
                        case MATROSKA_ID_VIDEOPIXELWIDTH: {
1315
                            uint64_t num;
1316
                            if ((res = ebml_read_uint(matroska, &id,
1317
                                                      &num)) < 0)
1318
                                break;
1319
                            videotrack->pixel_width = num;
1320
                            break;
1321
                        }
1322

    
1323
                        /* height of the video in the file */
1324
                        case MATROSKA_ID_VIDEOPIXELHEIGHT: {
1325
                            uint64_t num;
1326
                            if ((res = ebml_read_uint(matroska, &id,
1327
                                                      &num)) < 0)
1328
                                break;
1329
                            videotrack->pixel_height = num;
1330
                            break;
1331
                        }
1332

    
1333
                        /* whether the video is interlaced */
1334
                        case MATROSKA_ID_VIDEOFLAGINTERLACED: {
1335
                            uint64_t num;
1336
                            if ((res = ebml_read_uint(matroska, &id,
1337
                                                      &num)) < 0)
1338
                                break;
1339
                            if (num)
1340
                                track->flags |=
1341
                                    MATROSKA_VIDEOTRACK_INTERLACED;
1342
                            else
1343
                                track->flags &=
1344
                                    ~MATROSKA_VIDEOTRACK_INTERLACED;
1345
                            break;
1346
                        }
1347

    
1348
                        /* stereo mode (whether the video has two streams,
1349
                         * where one is for the left eye and the other for
1350
                         * the right eye, which creates a 3D-like
1351
                         * effect) */
1352
                        case MATROSKA_ID_VIDEOSTEREOMODE: {
1353
                            uint64_t num;
1354
                            if ((res = ebml_read_uint(matroska, &id,
1355
                                                      &num)) < 0)
1356
                                break;
1357
                            if (num != MATROSKA_EYE_MODE_MONO &&
1358
                                num != MATROSKA_EYE_MODE_LEFT &&
1359
                                num != MATROSKA_EYE_MODE_RIGHT &&
1360
                                num != MATROSKA_EYE_MODE_BOTH) {
1361
                                av_log(matroska->ctx, AV_LOG_INFO,
1362
                                       "Ignoring unknown eye mode 0x%x\n",
1363
                                       (uint32_t) num);
1364
                                break;
1365
                            }
1366
                            videotrack->eye_mode = num;
1367
                            break;
1368
                        }
1369

    
1370
                        /* aspect ratio behaviour */
1371
                        case MATROSKA_ID_VIDEOASPECTRATIO: {
1372
                            uint64_t num;
1373
                            if ((res = ebml_read_uint(matroska, &id,
1374
                                                      &num)) < 0)
1375
                                break;
1376
                            if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
1377
                                num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
1378
                                num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
1379
                                av_log(matroska->ctx, AV_LOG_INFO,
1380
                                       "Ignoring unknown aspect ratio 0x%x\n",
1381
                                       (uint32_t) num);
1382
                                break;
1383
                            }
1384
                            videotrack->ar_mode = num;
1385
                            break;
1386
                        }
1387

    
1388
                        /* colourspace (only matters for raw video)
1389
                         * fourcc */
1390
                        case MATROSKA_ID_VIDEOCOLOURSPACE: {
1391
                            uint64_t num;
1392
                            if ((res = ebml_read_uint(matroska, &id,
1393
                                                      &num)) < 0)
1394
                                break;
1395
                            videotrack->fourcc = num;
1396
                            break;
1397
                        }
1398

    
1399
                        default:
1400
                            av_log(matroska->ctx, AV_LOG_INFO,
1401
                                   "Unknown video track header entry "
1402
                                   "0x%x - ignoring\n", id);
1403
                            /* pass-through */
1404

    
1405
                        case EBML_ID_VOID:
1406
                            res = ebml_read_skip(matroska);
1407
                            break;
1408
                    }
1409

    
1410
                    if (matroska->level_up) {
1411
                        matroska->level_up--;
1412
                        break;
1413
                    }
1414
                }
1415
                break;
1416
            }
1417

    
1418
            /* tracktype specific stuff for audio */
1419
            case MATROSKA_ID_TRACKAUDIO: {
1420
                MatroskaAudioTrack *audiotrack;
1421
                if (!track->type)
1422
                    track->type = MATROSKA_TRACK_TYPE_AUDIO;
1423
                if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
1424
                    av_log(matroska->ctx, AV_LOG_INFO,
1425
                           "audio data in non-audio track - ignoring\n");
1426
                    res = AVERROR_INVALIDDATA;
1427
                    break;
1428
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1429
                    break;
1430
                audiotrack = (MatroskaAudioTrack *)track;
1431
                audiotrack->channels = 1;
1432
                audiotrack->samplerate = 8000;
1433

    
1434
                while (res == 0) {
1435
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1436
                        res = AVERROR_IO;
1437
                        break;
1438
                    } else if (matroska->level_up > 0) {
1439
                        matroska->level_up--;
1440
                        break;
1441
                    }
1442

    
1443
                    switch (id) {
1444
                        /* samplerate */
1445
                        case MATROSKA_ID_AUDIOSAMPLINGFREQ: {
1446
                            double num;
1447
                            if ((res = ebml_read_float(matroska, &id,
1448
                                                       &num)) < 0)
1449
                                break;
1450
                            audiotrack->internal_samplerate =
1451
                            audiotrack->samplerate = num;
1452
                            break;
1453
                        }
1454

    
1455
                        case MATROSKA_ID_AUDIOOUTSAMPLINGFREQ: {
1456
                            double num;
1457
                            if ((res = ebml_read_float(matroska, &id,
1458
                                                       &num)) < 0)
1459
                                break;
1460
                            audiotrack->samplerate = num;
1461
                            break;
1462
                        }
1463

    
1464
                            /* bitdepth */
1465
                        case MATROSKA_ID_AUDIOBITDEPTH: {
1466
                            uint64_t num;
1467
                            if ((res = ebml_read_uint(matroska, &id,
1468
                                                      &num)) < 0)
1469
                                break;
1470
                            audiotrack->bitdepth = num;
1471
                            break;
1472
                        }
1473

    
1474
                            /* channels */
1475
                        case MATROSKA_ID_AUDIOCHANNELS: {
1476
                            uint64_t num;
1477
                            if ((res = ebml_read_uint(matroska, &id,
1478
                                                      &num)) < 0)
1479
                                break;
1480
                            audiotrack->channels = num;
1481
                            break;
1482
                        }
1483

    
1484
                        default:
1485
                            av_log(matroska->ctx, AV_LOG_INFO,
1486
                                   "Unknown audio track header entry "
1487
                                   "0x%x - ignoring\n", id);
1488
                            /* pass-through */
1489

    
1490
                        case EBML_ID_VOID:
1491
                            res = ebml_read_skip(matroska);
1492
                            break;
1493
                    }
1494

    
1495
                    if (matroska->level_up) {
1496
                        matroska->level_up--;
1497
                        break;
1498
                    }
1499
                }
1500
                break;
1501
            }
1502

    
1503
                /* codec identifier */
1504
            case MATROSKA_ID_CODECID: {
1505
                char *text;
1506
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
1507
                    break;
1508
                track->codec_id = text;
1509
                break;
1510
            }
1511

    
1512
                /* codec private data */
1513
            case MATROSKA_ID_CODECPRIVATE: {
1514
                uint8_t *data;
1515
                int size;
1516
                if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0))
1517
                    break;
1518
                track->codec_priv = data;
1519
                track->codec_priv_size = size;
1520
                break;
1521
            }
1522

    
1523
                /* name of the codec */
1524
            case MATROSKA_ID_CODECNAME: {
1525
                char *text;
1526
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1527
                    break;
1528
                track->codec_name = text;
1529
                break;
1530
            }
1531

    
1532
                /* name of this track */
1533
            case MATROSKA_ID_TRACKNAME: {
1534
                char *text;
1535
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1536
                    break;
1537
                track->name = text;
1538
                break;
1539
            }
1540

    
1541
                /* language (matters for audio/subtitles, mostly) */
1542
            case MATROSKA_ID_TRACKLANGUAGE: {
1543
                char *text;
1544
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1545
                    break;
1546
                track->language = text;
1547
                break;
1548
            }
1549

    
1550
                /* whether this is actually used */
1551
            case MATROSKA_ID_TRACKFLAGENABLED: {
1552
                uint64_t num;
1553
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1554
                    break;
1555
                if (num)
1556
                    track->flags |= MATROSKA_TRACK_ENABLED;
1557
                else
1558
                    track->flags &= ~MATROSKA_TRACK_ENABLED;
1559
                break;
1560
            }
1561

    
1562
                /* whether it's the default for this track type */
1563
            case MATROSKA_ID_TRACKFLAGDEFAULT: {
1564
                uint64_t num;
1565
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1566
                    break;
1567
                if (num)
1568
                    track->flags |= MATROSKA_TRACK_DEFAULT;
1569
                else
1570
                    track->flags &= ~MATROSKA_TRACK_DEFAULT;
1571
                break;
1572
            }
1573

    
1574
                /* lacing (like MPEG, where blocks don't end/start on frame
1575
                 * boundaries) */
1576
            case MATROSKA_ID_TRACKFLAGLACING: {
1577
                uint64_t num;
1578
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1579
                    break;
1580
                if (num)
1581
                    track->flags |= MATROSKA_TRACK_LACING;
1582
                else
1583
                    track->flags &= ~MATROSKA_TRACK_LACING;
1584
                break;
1585
            }
1586

    
1587
                /* default length (in time) of one data block in this track */
1588
            case MATROSKA_ID_TRACKDEFAULTDURATION: {
1589
                uint64_t num;
1590
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1591
                    break;
1592
                track->default_duration = num / matroska->time_scale;
1593
                break;
1594
            }
1595

    
1596
            default:
1597
                av_log(matroska->ctx, AV_LOG_INFO,
1598
                       "Unknown track header entry 0x%x - ignoring\n", id);
1599
                /* pass-through */
1600

    
1601
            case EBML_ID_VOID:
1602
            /* we ignore these because they're nothing useful. */
1603
            case MATROSKA_ID_CODECINFOURL:
1604
            case MATROSKA_ID_CODECDOWNLOADURL:
1605
            case MATROSKA_ID_TRACKMINCACHE:
1606
            case MATROSKA_ID_TRACKMAXCACHE:
1607
                res = ebml_read_skip(matroska);
1608
                break;
1609
        }
1610

    
1611
        if (matroska->level_up) {
1612
            matroska->level_up--;
1613
            break;
1614
        }
1615
    }
1616

    
1617
    return res;
1618
}
1619

    
1620
static int
1621
matroska_parse_tracks (MatroskaDemuxContext *matroska)
1622
{
1623
    int res = 0;
1624
    uint32_t id;
1625

    
1626
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n");
1627

    
1628
    while (res == 0) {
1629
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1630
            res = AVERROR_IO;
1631
            break;
1632
        } else if (matroska->level_up) {
1633
            matroska->level_up--;
1634
            break;
1635
        }
1636

    
1637
        switch (id) {
1638
            /* one track within the "all-tracks" header */
1639
            case MATROSKA_ID_TRACKENTRY:
1640
                res = matroska_add_stream(matroska);
1641
                break;
1642

    
1643
            default:
1644
                av_log(matroska->ctx, AV_LOG_INFO,
1645
                       "Unknown entry 0x%x in track header\n", id);
1646
                /* fall-through */
1647

    
1648
            case EBML_ID_VOID:
1649
                res = ebml_read_skip(matroska);
1650
                break;
1651
        }
1652

    
1653
        if (matroska->level_up) {
1654
            matroska->level_up--;
1655
            break;
1656
        }
1657
    }
1658

    
1659
    return res;
1660
}
1661

    
1662
static int
1663
matroska_parse_index (MatroskaDemuxContext *matroska)
1664
{
1665
    int res = 0;
1666
    uint32_t id;
1667
    MatroskaDemuxIndex idx;
1668

    
1669
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n");
1670

    
1671
    while (res == 0) {
1672
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1673
            res = AVERROR_IO;
1674
            break;
1675
        } else if (matroska->level_up) {
1676
            matroska->level_up--;
1677
            break;
1678
        }
1679

    
1680
        switch (id) {
1681
            /* one single index entry ('point') */
1682
            case MATROSKA_ID_POINTENTRY:
1683
                if ((res = ebml_read_master(matroska, &id)) < 0)
1684
                    break;
1685

    
1686
                /* in the end, we hope to fill one entry with a
1687
                 * timestamp, a file position and a tracknum */
1688
                idx.pos   = (uint64_t) -1;
1689
                idx.time  = (uint64_t) -1;
1690
                idx.track = (uint16_t) -1;
1691

    
1692
                while (res == 0) {
1693
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1694
                        res = AVERROR_IO;
1695
                        break;
1696
                    } else if (matroska->level_up) {
1697
                        matroska->level_up--;
1698
                        break;
1699
                    }
1700

    
1701
                    switch (id) {
1702
                        /* one single index entry ('point') */
1703
                        case MATROSKA_ID_CUETIME: {
1704
                            uint64_t time;
1705
                            if ((res = ebml_read_uint(matroska, &id,
1706
                                                      &time)) < 0)
1707
                                break;
1708
                            idx.time = time * matroska->time_scale;
1709
                            break;
1710
                        }
1711

    
1712
                        /* position in the file + track to which it
1713
                         * belongs */
1714
                        case MATROSKA_ID_CUETRACKPOSITION:
1715
                            if ((res = ebml_read_master(matroska, &id)) < 0)
1716
                                break;
1717

    
1718
                            while (res == 0) {
1719
                                if (!(id = ebml_peek_id (matroska,
1720
                                                    &matroska->level_up))) {
1721
                                    res = AVERROR_IO;
1722
                                    break;
1723
                                } else if (matroska->level_up) {
1724
                                    matroska->level_up--;
1725
                                    break;
1726
                                }
1727

    
1728
                                switch (id) {
1729
                                    /* track number */
1730
                                    case MATROSKA_ID_CUETRACK: {
1731
                                        uint64_t num;
1732
                                        if ((res = ebml_read_uint(matroska,
1733
                                                          &id, &num)) < 0)
1734
                                            break;
1735
                                        idx.track = num;
1736
                                        break;
1737
                                    }
1738

    
1739
                                        /* position in file */
1740
                                    case MATROSKA_ID_CUECLUSTERPOSITION: {
1741
                                        uint64_t num;
1742
                                        if ((res = ebml_read_uint(matroska,
1743
                                                          &id, &num)) < 0)
1744
                                            break;
1745
                                        idx.pos = num+matroska->segment_start;
1746
                                        break;
1747
                                    }
1748

    
1749
                                    default:
1750
                                        av_log(matroska->ctx, AV_LOG_INFO,
1751
                                               "Unknown entry 0x%x in "
1752
                                               "CuesTrackPositions\n", id);
1753
                                        /* fall-through */
1754

    
1755
                                    case EBML_ID_VOID:
1756
                                        res = ebml_read_skip(matroska);
1757
                                        break;
1758
                                }
1759

    
1760
                                if (matroska->level_up) {
1761
                                    matroska->level_up--;
1762
                                    break;
1763
                                }
1764
                            }
1765

    
1766
                            break;
1767

    
1768
                        default:
1769
                            av_log(matroska->ctx, AV_LOG_INFO,
1770
                                   "Unknown entry 0x%x in cuespoint "
1771
                                   "index\n", id);
1772
                            /* fall-through */
1773

    
1774
                        case EBML_ID_VOID:
1775
                            res = ebml_read_skip(matroska);
1776
                            break;
1777
                    }
1778

    
1779
                    if (matroska->level_up) {
1780
                        matroska->level_up--;
1781
                        break;
1782
                    }
1783
                }
1784

    
1785
                /* so let's see if we got what we wanted */
1786
                if (idx.pos   != (uint64_t) -1 &&
1787
                    idx.time  != (uint64_t) -1 &&
1788
                    idx.track != (uint16_t) -1) {
1789
                    if (matroska->num_indexes % 32 == 0) {
1790
                        /* re-allocate bigger index */
1791
                        matroska->index =
1792
                            av_realloc(matroska->index,
1793
                                       (matroska->num_indexes + 32) *
1794
                                       sizeof(MatroskaDemuxIndex));
1795
                    }
1796
                    matroska->index[matroska->num_indexes] = idx;
1797
                    matroska->num_indexes++;
1798
                }
1799
                break;
1800

    
1801
            default:
1802
                av_log(matroska->ctx, AV_LOG_INFO,
1803
                       "Unknown entry 0x%x in cues header\n", id);
1804
                /* fall-through */
1805

    
1806
            case EBML_ID_VOID:
1807
                res = ebml_read_skip(matroska);
1808
                break;
1809
        }
1810

    
1811
        if (matroska->level_up) {
1812
            matroska->level_up--;
1813
            break;
1814
        }
1815
    }
1816

    
1817
    return res;
1818
}
1819

    
1820
static int
1821
matroska_parse_metadata (MatroskaDemuxContext *matroska)
1822
{
1823
    int res = 0;
1824
    uint32_t id;
1825

    
1826
    while (res == 0) {
1827
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1828
            res = AVERROR_IO;
1829
            break;
1830
        } else if (matroska->level_up) {
1831
            matroska->level_up--;
1832
            break;
1833
        }
1834

    
1835
        switch (id) {
1836
            /* Hm, this is unsupported... */
1837
            default:
1838
                av_log(matroska->ctx, AV_LOG_INFO,
1839
                       "Unknown entry 0x%x in metadata header\n", id);
1840
                /* fall-through */
1841

    
1842
            case EBML_ID_VOID:
1843
                res = ebml_read_skip(matroska);
1844
                break;
1845
        }
1846

    
1847
        if (matroska->level_up) {
1848
            matroska->level_up--;
1849
            break;
1850
        }
1851
    }
1852

    
1853
    return res;
1854
}
1855

    
1856
static int
1857
matroska_parse_seekhead (MatroskaDemuxContext *matroska)
1858
{
1859
    int res = 0;
1860
    uint32_t id;
1861

    
1862
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
1863

    
1864
    while (res == 0) {
1865
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1866
            res = AVERROR_IO;
1867
            break;
1868
        } else if (matroska->level_up) {
1869
            matroska->level_up--;
1870
            break;
1871
        }
1872

    
1873
        switch (id) {
1874
            case MATROSKA_ID_SEEKENTRY: {
1875
                uint32_t seek_id = 0, peek_id_cache = 0;
1876
                uint64_t seek_pos = (uint64_t) -1, t;
1877

    
1878
                if ((res = ebml_read_master(matroska, &id)) < 0)
1879
                    break;
1880

    
1881
                while (res == 0) {
1882
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1883
                        res = AVERROR_IO;
1884
                        break;
1885
                    } else if (matroska->level_up) {
1886
                        matroska->level_up--;
1887
                        break;
1888
                    }
1889

    
1890
                    switch (id) {
1891
                        case MATROSKA_ID_SEEKID:
1892
                            res = ebml_read_uint(matroska, &id, &t);
1893
                            seek_id = t;
1894
                            break;
1895

    
1896
                        case MATROSKA_ID_SEEKPOSITION:
1897
                            res = ebml_read_uint(matroska, &id, &seek_pos);
1898
                            break;
1899

    
1900
                        default:
1901
                            av_log(matroska->ctx, AV_LOG_INFO,
1902
                                   "Unknown seekhead ID 0x%x\n", id);
1903
                            /* fall-through */
1904

    
1905
                        case EBML_ID_VOID:
1906
                            res = ebml_read_skip(matroska);
1907
                            break;
1908
                    }
1909

    
1910
                    if (matroska->level_up) {
1911
                        matroska->level_up--;
1912
                        break;
1913
                    }
1914
                }
1915

    
1916
                if (!seek_id || seek_pos == (uint64_t) -1) {
1917
                    av_log(matroska->ctx, AV_LOG_INFO,
1918
                           "Incomplete seekhead entry (0x%x/%"PRIu64")\n",
1919
                           seek_id, seek_pos);
1920
                    break;
1921
                }
1922

    
1923
                switch (seek_id) {
1924
                    case MATROSKA_ID_CUES:
1925
                    case MATROSKA_ID_TAGS: {
1926
                        uint32_t level_up = matroska->level_up;
1927
                        offset_t before_pos;
1928
                        uint64_t length;
1929
                        MatroskaLevel level;
1930

    
1931
                        /* remember the peeked ID and the current position */
1932
                        peek_id_cache = matroska->peek_id;
1933
                        before_pos = url_ftell(&matroska->ctx->pb);
1934

    
1935
                        /* seek */
1936
                        if ((res = ebml_read_seek(matroska, seek_pos +
1937
                                               matroska->segment_start)) < 0)
1938
                            return res;
1939

    
1940
                        /* we don't want to lose our seekhead level, so we add
1941
                         * a dummy. This is a crude hack. */
1942
                        if (matroska->num_levels == EBML_MAX_DEPTH) {
1943
                            av_log(matroska->ctx, AV_LOG_INFO,
1944
                                   "Max EBML element depth (%d) reached, "
1945
                                   "cannot parse further.\n", EBML_MAX_DEPTH);
1946
                            return AVERROR_UNKNOWN;
1947
                        }
1948

    
1949
                        level.start = 0;
1950
                        level.length = (uint64_t)-1;
1951
                        matroska->levels[matroska->num_levels] = level;
1952
                        matroska->num_levels++;
1953

    
1954
                        /* check ID */
1955
                        if (!(id = ebml_peek_id (matroska,
1956
                                                 &matroska->level_up)))
1957
                            goto finish;
1958
                        if (id != seek_id) {
1959
                            av_log(matroska->ctx, AV_LOG_INFO,
1960
                                   "We looked for ID=0x%x but got "
1961
                                   "ID=0x%x (pos=%"PRIu64")",
1962
                                   seek_id, id, seek_pos +
1963
                                   matroska->segment_start);
1964
                            goto finish;
1965
                        }
1966

    
1967
                        /* read master + parse */
1968
                        if ((res = ebml_read_master(matroska, &id)) < 0)
1969
                            goto finish;
1970
                        switch (id) {
1971
                            case MATROSKA_ID_CUES:
1972
                                if (!(res = matroska_parse_index(matroska)) ||
1973
                                    url_feof(&matroska->ctx->pb)) {
1974
                                    matroska->index_parsed = 1;
1975
                                    res = 0;
1976
                                }
1977
                                break;
1978
                            case MATROSKA_ID_TAGS:
1979
                                if (!(res = matroska_parse_metadata(matroska)) ||
1980
                                   url_feof(&matroska->ctx->pb)) {
1981
                                    matroska->metadata_parsed = 1;
1982
                                    res = 0;
1983
                                }
1984
                                break;
1985
                        }
1986

    
1987
                    finish:
1988
                        /* remove dummy level */
1989
                        while (matroska->num_levels) {
1990
                            matroska->num_levels--;
1991
                            length =
1992
                                matroska->levels[matroska->num_levels].length;
1993
                            if (length == (uint64_t)-1)
1994
                                break;
1995
                        }
1996

    
1997
                        /* seek back */
1998
                        if ((res = ebml_read_seek(matroska, before_pos)) < 0)
1999
                            return res;
2000
                        matroska->peek_id = peek_id_cache;
2001
                        matroska->level_up = level_up;
2002
                        break;
2003
                    }
2004

    
2005
                    default:
2006
                        av_log(matroska->ctx, AV_LOG_INFO,
2007
                               "Ignoring seekhead entry for ID=0x%x\n",
2008
                               seek_id);
2009
                        break;
2010
                }
2011

    
2012
                break;
2013
            }
2014

    
2015
            default:
2016
                av_log(matroska->ctx, AV_LOG_INFO,
2017
                       "Unknown seekhead ID 0x%x\n", id);
2018
                /* fall-through */
2019

    
2020
            case EBML_ID_VOID:
2021
                res = ebml_read_skip(matroska);
2022
                break;
2023
        }
2024

    
2025
        if (matroska->level_up) {
2026
            matroska->level_up--;
2027
            break;
2028
        }
2029
    }
2030

    
2031
    return res;
2032
}
2033

    
2034
#define ARRAY_SIZE(x)  (sizeof(x)/sizeof(*x))
2035

    
2036
static int
2037
matroska_aac_profile (char *codec_id)
2038
{
2039
    static const char *aac_profiles[] = {
2040
        "MAIN", "LC", "SSR"
2041
    };
2042
    int profile;
2043

    
2044
    for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
2045
        if (strstr(codec_id, aac_profiles[profile]))
2046
            break;
2047
    return profile + 1;
2048
}
2049

    
2050
static int
2051
matroska_aac_sri (int samplerate)
2052
{
2053
    static const int aac_sample_rates[] = {
2054
        96000, 88200, 64000, 48000, 44100, 32000,
2055
        24000, 22050, 16000, 12000, 11025,  8000,
2056
    };
2057
    int sri;
2058

    
2059
    for (sri=0; sri<ARRAY_SIZE(aac_sample_rates); sri++)
2060
        if (aac_sample_rates[sri] == samplerate)
2061
            break;
2062
    return sri;
2063
}
2064

    
2065
static int
2066
matroska_read_header (AVFormatContext    *s,
2067
                      AVFormatParameters *ap)
2068
{
2069
    MatroskaDemuxContext *matroska = s->priv_data;
2070
    char *doctype;
2071
    int version, last_level, res = 0;
2072
    uint32_t id;
2073

    
2074
    matroska->ctx = s;
2075

    
2076
    /* First read the EBML header. */
2077
    doctype = NULL;
2078
    if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
2079
        return res;
2080
    if ((doctype == NULL) || strcmp(doctype, "matroska")) {
2081
        av_log(matroska->ctx, AV_LOG_ERROR,
2082
               "Wrong EBML doctype ('%s' != 'matroska').\n",
2083
               doctype ? doctype : "(none)");
2084
        if (doctype)
2085
            av_free(doctype);
2086
        return AVERROR_NOFMT;
2087
    }
2088
    av_free(doctype);
2089
    if (version > 2) {
2090
        av_log(matroska->ctx, AV_LOG_ERROR,
2091
               "Matroska demuxer version 2 too old for file version %d\n",
2092
               version);
2093
        return AVERROR_NOFMT;
2094
    }
2095

    
2096
    /* The next thing is a segment. */
2097
    while (1) {
2098
        if (!(id = ebml_peek_id(matroska, &last_level)))
2099
            return AVERROR_IO;
2100
        if (id == MATROSKA_ID_SEGMENT)
2101
            break;
2102

    
2103
        /* oi! */
2104
        av_log(matroska->ctx, AV_LOG_INFO,
2105
               "Expected a Segment ID (0x%x), but received 0x%x!\n",
2106
               MATROSKA_ID_SEGMENT, id);
2107
        if ((res = ebml_read_skip(matroska)) < 0)
2108
            return res;
2109
    }
2110

    
2111
    /* We now have a Matroska segment.
2112
     * Seeks are from the beginning of the segment,
2113
     * after the segment ID/length. */
2114
    if ((res = ebml_read_master(matroska, &id)) < 0)
2115
        return res;
2116
    matroska->segment_start = url_ftell(&s->pb);
2117

    
2118
    matroska->time_scale = 1000000;
2119
    /* we've found our segment, start reading the different contents in here */
2120
    while (res == 0) {
2121
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2122
            res = AVERROR_IO;
2123
            break;
2124
        } else if (matroska->level_up) {
2125
            matroska->level_up--;
2126
            break;
2127
        }
2128

    
2129
        switch (id) {
2130
            /* stream info */
2131
            case MATROSKA_ID_INFO: {
2132
                if ((res = ebml_read_master(matroska, &id)) < 0)
2133
                    break;
2134
                res = matroska_parse_info(matroska);
2135
                break;
2136
            }
2137

    
2138
            /* track info headers */
2139
            case MATROSKA_ID_TRACKS: {
2140
                if ((res = ebml_read_master(matroska, &id)) < 0)
2141
                    break;
2142
                res = matroska_parse_tracks(matroska);
2143
                break;
2144
            }
2145

    
2146
            /* stream index */
2147
            case MATROSKA_ID_CUES: {
2148
                if (!matroska->index_parsed) {
2149
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2150
                        break;
2151
                    res = matroska_parse_index(matroska);
2152
                } else
2153
                    res = ebml_read_skip(matroska);
2154
                break;
2155
            }
2156

    
2157
            /* metadata */
2158
            case MATROSKA_ID_TAGS: {
2159
                if (!matroska->metadata_parsed) {
2160
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2161
                        break;
2162
                    res = matroska_parse_metadata(matroska);
2163
                } else
2164
                    res = ebml_read_skip(matroska);
2165
                break;
2166
            }
2167

    
2168
            /* file index (if seekable, seek to Cues/Tags to parse it) */
2169
            case MATROSKA_ID_SEEKHEAD: {
2170
                if ((res = ebml_read_master(matroska, &id)) < 0)
2171
                    break;
2172
                res = matroska_parse_seekhead(matroska);
2173
                break;
2174
            }
2175

    
2176
            case MATROSKA_ID_CLUSTER: {
2177
                /* Do not read the master - this will be done in the next
2178
                 * call to matroska_read_packet. */
2179
                res = 1;
2180
                break;
2181
            }
2182

    
2183
            default:
2184
                av_log(matroska->ctx, AV_LOG_INFO,
2185
                       "Unknown matroska file header ID 0x%x\n", id);
2186
            /* fall-through */
2187

    
2188
            case EBML_ID_VOID:
2189
                res = ebml_read_skip(matroska);
2190
                break;
2191
        }
2192

    
2193
        if (matroska->level_up) {
2194
            matroska->level_up--;
2195
            break;
2196
        }
2197
    }
2198

    
2199
    /* Have we found a cluster? */
2200
    if (ebml_peek_id(matroska, NULL) == MATROSKA_ID_CLUSTER) {
2201
        int i, j;
2202
        MatroskaTrack *track;
2203
        AVStream *st;
2204

    
2205
        for (i = 0; i < matroska->num_tracks; i++) {
2206
            enum CodecID codec_id = CODEC_ID_NONE;
2207
            uint8_t *extradata = NULL;
2208
            int extradata_size = 0;
2209
            int extradata_offset = 0;
2210
            track = matroska->tracks[i];
2211

    
2212
            /* libavformat does not really support subtitles.
2213
             * Also apply some sanity checks. */
2214
            if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
2215
                (track->codec_id == NULL))
2216
                continue;
2217

    
2218
            for(j=0; codec_tags[j].str; j++){
2219
                if(!strncmp(codec_tags[j].str, track->codec_id,
2220
                            strlen(codec_tags[j].str))){
2221
                    codec_id= codec_tags[j].id;
2222
                    break;
2223
                }
2224
            }
2225

    
2226
            /* Set the FourCC from the CodecID. */
2227
            /* This is the MS compatibility mode which stores a
2228
             * BITMAPINFOHEADER in the CodecPrivate. */
2229
            if (!strcmp(track->codec_id,
2230
                        MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
2231
                (track->codec_priv_size >= 40) &&
2232
                (track->codec_priv != NULL)) {
2233
                unsigned char *p;
2234

    
2235
                /* Offset of biCompression. Stored in LE. */
2236
                p = (unsigned char *)track->codec_priv + 16;
2237
                ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
2238
                                 (p[2] << 16) | (p[1] << 8) | p[0];
2239
                codec_id = codec_get_id(codec_bmp_tags, ((MatroskaVideoTrack *)track)->fourcc);
2240

    
2241
            }
2242

    
2243
            /* This is the MS compatibility mode which stores a
2244
             * WAVEFORMATEX in the CodecPrivate. */
2245
            else if (!strcmp(track->codec_id,
2246
                             MATROSKA_CODEC_ID_AUDIO_ACM) &&
2247
                (track->codec_priv_size >= 18) &&
2248
                (track->codec_priv != NULL)) {
2249
                unsigned char *p;
2250
                uint16_t tag;
2251

    
2252
                /* Offset of wFormatTag. Stored in LE. */
2253
                p = (unsigned char *)track->codec_priv;
2254
                tag = (p[1] << 8) | p[0];
2255
                codec_id = codec_get_id(codec_wav_tags, tag);
2256

    
2257
            }
2258

    
2259
            else if (codec_id == CODEC_ID_AAC && !track->codec_priv_size) {
2260
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2261
                int profile = matroska_aac_profile(track->codec_id);
2262
                int sri = matroska_aac_sri(audiotrack->internal_samplerate);
2263
                extradata = av_malloc(5);
2264
                if (extradata == NULL)
2265
                    return AVERROR_NOMEM;
2266
                extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
2267
                extradata[1] = ((sri&0x01) << 7) | (audiotrack->channels<<3);
2268
                if (strstr(track->codec_id, "SBR")) {
2269
                    sri = matroska_aac_sri(audiotrack->samplerate);
2270
                    extradata[2] = 0x56;
2271
                    extradata[3] = 0xE5;
2272
                    extradata[4] = 0x80 | (sri<<3);
2273
                    extradata_size = 5;
2274
                } else {
2275
                    extradata_size = 2;
2276
                }
2277
                track->default_duration = 1024*1000 / audiotrack->internal_samplerate;
2278
            }
2279

    
2280
            else if (codec_id == CODEC_ID_TTA) {
2281
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2282
                ByteIOContext b;
2283
                extradata_size = 30;
2284
                extradata = av_mallocz(extradata_size);
2285
                if (extradata == NULL)
2286
                    return AVERROR_NOMEM;
2287
                init_put_byte(&b, extradata, extradata_size, 1,
2288
                              NULL, NULL, NULL, NULL);
2289
                put_buffer(&b, (uint8_t *) "TTA1", 4);
2290
                put_le16(&b, 1);
2291
                put_le16(&b, audiotrack->channels);
2292
                put_le16(&b, audiotrack->bitdepth);
2293
                put_le32(&b, audiotrack->samplerate);
2294
                put_le32(&b, matroska->ctx->duration * audiotrack->samplerate);
2295
            }
2296

    
2297
            else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
2298
                     codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
2299
                extradata_offset = 26;
2300
                track->codec_priv_size -= extradata_offset;
2301
                track->flags |= MATROSKA_TRACK_REAL_V;
2302
            }
2303

    
2304
            if (codec_id == CODEC_ID_NONE) {
2305
                av_log(matroska->ctx, AV_LOG_INFO,
2306
                       "Unknown/unsupported CodecID %s.\n",
2307
                       track->codec_id);
2308
            }
2309

    
2310
            track->stream_index = matroska->num_streams;
2311

    
2312
            matroska->num_streams++;
2313
            st = av_new_stream(s, track->stream_index);
2314
            if (st == NULL)
2315
                return AVERROR_NOMEM;
2316
            av_set_pts_info(st, 64, matroska->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
2317

    
2318
            st->codec->codec_id = codec_id;
2319
            st->start_time = 0;
2320

    
2321
            if (track->default_duration)
2322
                av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
2323
                          track->default_duration, 1000, 30000);
2324

    
2325
            if(extradata){
2326
                st->codec->extradata = extradata;
2327
                st->codec->extradata_size = extradata_size;
2328
            } else if(track->codec_priv && track->codec_priv_size > 0){
2329
                st->codec->extradata = av_malloc(track->codec_priv_size);
2330
                if(st->codec->extradata == NULL)
2331
                    return AVERROR_NOMEM;
2332
                st->codec->extradata_size = track->codec_priv_size;
2333
                memcpy(st->codec->extradata,track->codec_priv+extradata_offset,
2334
                       track->codec_priv_size);
2335
            }
2336

    
2337
            if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2338
                MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
2339

    
2340
                st->codec->codec_type = CODEC_TYPE_VIDEO;
2341
                st->codec->codec_tag = videotrack->fourcc;
2342
                st->codec->width = videotrack->pixel_width;
2343
                st->codec->height = videotrack->pixel_height;
2344
                if (videotrack->display_width == 0)
2345
                    videotrack->display_width= videotrack->pixel_width;
2346
                if (videotrack->display_height == 0)
2347
                    videotrack->display_height= videotrack->pixel_height;
2348
                av_reduce(&st->codec->sample_aspect_ratio.num,
2349
                          &st->codec->sample_aspect_ratio.den,
2350
                          st->codec->height * videotrack->display_width,
2351
                          st->codec-> width * videotrack->display_height,
2352
                          255);
2353
                st->need_parsing = 2;
2354
            } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2355
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
2356

    
2357
                st->codec->codec_type = CODEC_TYPE_AUDIO;
2358
                st->codec->sample_rate = audiotrack->samplerate;
2359
                st->codec->channels = audiotrack->channels;
2360
            } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2361
                st->codec->codec_type = CODEC_TYPE_SUBTITLE;
2362
            }
2363

    
2364
            /* What do we do with private data? E.g. for Vorbis. */
2365
        }
2366
        res = 0;
2367
    }
2368

    
2369
    return res;
2370
}
2371

    
2372
static inline int
2373
rv_offset(uint8_t *data, int slice, int slices)
2374
{
2375
    return AV_RL32(data+8*slice+4) + 8*slices;
2376
}
2377

    
2378
static int
2379
matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data, int size,
2380
                     int64_t pos, uint64_t cluster_time, uint64_t duration,
2381
                     int is_keyframe, int is_bframe)
2382
{
2383
    int res = 0;
2384
    int track;
2385
    AVPacket *pkt;
2386
    uint8_t *origdata = data;
2387
    int16_t block_time;
2388
    uint32_t *lace_size = NULL;
2389
    int n, flags, laces = 0;
2390
    uint64_t num;
2391

    
2392
    /* first byte(s): tracknum */
2393
    if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
2394
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2395
        av_free(origdata);
2396
        return res;
2397
    }
2398
    data += n;
2399
    size -= n;
2400

    
2401
    /* fetch track from num */
2402
    track = matroska_find_track_by_num(matroska, num);
2403
    if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
2404
        av_log(matroska->ctx, AV_LOG_INFO,
2405
               "Invalid stream %d or size %u\n", track, size);
2406
        av_free(origdata);
2407
        return res;
2408
    }
2409
    if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){
2410
        av_free(origdata);
2411
        return res;
2412
    }
2413
    if (duration == AV_NOPTS_VALUE)
2414
        duration = matroska->tracks[track]->default_duration;
2415

    
2416
    /* block_time (relative to cluster time) */
2417
    block_time = (data[0] << 8) | data[1];
2418
    data += 2;
2419
    size -= 2;
2420
    flags = *data;
2421
    data += 1;
2422
    size -= 1;
2423
    if (is_keyframe == -1)
2424
        is_keyframe = flags & 1 ? PKT_FLAG_KEY : 0;
2425
    switch ((flags & 0x06) >> 1) {
2426
        case 0x0: /* no lacing */
2427
            laces = 1;
2428
            lace_size = av_mallocz(sizeof(int));
2429
            lace_size[0] = size;
2430
            break;
2431

    
2432
        case 0x1: /* xiph lacing */
2433
        case 0x2: /* fixed-size lacing */
2434
        case 0x3: /* EBML lacing */
2435
            if (size == 0) {
2436
                res = -1;
2437
                break;
2438
            }
2439
            laces = (*data) + 1;
2440
            data += 1;
2441
            size -= 1;
2442
            lace_size = av_mallocz(laces * sizeof(int));
2443

    
2444
            switch ((flags & 0x06) >> 1) {
2445
                case 0x1: /* xiph lacing */ {
2446
                    uint8_t temp;
2447
                    uint32_t total = 0;
2448
                    for (n = 0; res == 0 && n < laces - 1; n++) {
2449
                        while (1) {
2450
                            if (size == 0) {
2451
                                res = -1;
2452
                                break;
2453
                            }
2454
                            temp = *data;
2455
                            lace_size[n] += temp;
2456
                            data += 1;
2457
                            size -= 1;
2458
                            if (temp != 0xff)
2459
                                break;
2460
                        }
2461
                        total += lace_size[n];
2462
                    }
2463
                    lace_size[n] = size - total;
2464
                    break;
2465
                }
2466

    
2467
                case 0x2: /* fixed-size lacing */
2468
                    for (n = 0; n < laces; n++)
2469
                        lace_size[n] = size / laces;
2470
                    break;
2471

    
2472
                case 0x3: /* EBML lacing */ {
2473
                    uint32_t total;
2474
                    n = matroska_ebmlnum_uint(data, size, &num);
2475
                    if (n < 0) {
2476
                        av_log(matroska->ctx, AV_LOG_INFO,
2477
                               "EBML block data error\n");
2478
                        break;
2479
                    }
2480
                    data += n;
2481
                    size -= n;
2482
                    total = lace_size[0] = num;
2483
                    for (n = 1; res == 0 && n < laces - 1; n++) {
2484
                        int64_t snum;
2485
                        int r;
2486
                        r = matroska_ebmlnum_sint (data, size, &snum);
2487
                        if (r < 0) {
2488
                            av_log(matroska->ctx, AV_LOG_INFO,
2489
                                   "EBML block data error\n");
2490
                            break;
2491
                        }
2492
                        data += r;
2493
                        size -= r;
2494
                        lace_size[n] = lace_size[n - 1] + snum;
2495
                        total += lace_size[n];
2496
                    }
2497
                    lace_size[n] = size - total;
2498
                    break;
2499
                }
2500
            }
2501
            break;
2502
    }
2503

    
2504
    if (res == 0) {
2505
        int real_v = matroska->tracks[track]->flags & MATROSKA_TRACK_REAL_V;
2506
        uint64_t timecode = AV_NOPTS_VALUE;
2507

    
2508
        if (cluster_time != (uint64_t)-1 && cluster_time + block_time >= 0)
2509
            timecode = cluster_time + block_time;
2510

    
2511
        for (n = 0; n < laces; n++) {
2512
            int slice, slices = 1;
2513

    
2514
            if (real_v) {
2515
                slices = *data++ + 1;
2516
                lace_size[n]--;
2517
            }
2518

    
2519
            for (slice=0; slice<slices; slice++) {
2520
                int slice_size, slice_offset = 0;
2521
                if (real_v)
2522
                    slice_offset = rv_offset(data, slice, slices);
2523
                if (slice+1 == slices)
2524
                    slice_size = lace_size[n] - slice_offset;
2525
                else
2526
                    slice_size = rv_offset(data, slice+1, slices) - slice_offset;
2527
                pkt = av_mallocz(sizeof(AVPacket));
2528
                /* XXX: prevent data copy... */
2529
                if (av_new_packet(pkt, slice_size) < 0) {
2530
                    res = AVERROR_NOMEM;
2531
                    n = laces-1;
2532
                    break;
2533
                }
2534
                memcpy (pkt->data, data+slice_offset, slice_size);
2535

    
2536
                if (n == 0)
2537
                    pkt->flags = is_keyframe;
2538
                pkt->stream_index = matroska->tracks[track]->stream_index;
2539

    
2540
                pkt->pts = timecode;
2541
                pkt->pos = pos;
2542
                pkt->duration = duration;
2543

    
2544
                    matroska_queue_packet(matroska, pkt);
2545

    
2546
                if (timecode != AV_NOPTS_VALUE)
2547
                    timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
2548
            }
2549
            data += lace_size[n];
2550
        }
2551
    }
2552

    
2553
    av_free(lace_size);
2554
    av_free(origdata);
2555
    return res;
2556
}
2557

    
2558
static int
2559
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2560
                           uint64_t              cluster_time)
2561
{
2562
    int res = 0;
2563
    uint32_t id;
2564
    int is_bframe = 0;
2565
    int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2566
    uint64_t duration = AV_NOPTS_VALUE;
2567
    uint8_t *data;
2568
    int size = 0;
2569
    int64_t pos = 0;
2570

    
2571
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2572

    
2573
    while (res == 0) {
2574
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2575
            res = AVERROR_IO;
2576
            break;
2577
        } else if (matroska->level_up) {
2578
            matroska->level_up--;
2579
            break;
2580
        }
2581

    
2582
        switch (id) {
2583
            /* one block inside the group. Note, block parsing is one
2584
             * of the harder things, so this code is a bit complicated.
2585
             * See http://www.matroska.org/ for documentation. */
2586
            case MATROSKA_ID_BLOCK: {
2587
                pos = url_ftell(&matroska->ctx->pb);
2588
                res = ebml_read_binary(matroska, &id, &data, &size);
2589
                break;
2590
            }
2591

    
2592
            case MATROSKA_ID_BLOCKDURATION: {
2593
                if ((res = ebml_read_uint(matroska, &id, &duration)) < 0)
2594
                    break;
2595
                duration /= matroska->time_scale;
2596
                break;
2597
            }
2598

    
2599
            case MATROSKA_ID_BLOCKREFERENCE: {
2600
                int64_t num;
2601
                /* We've found a reference, so not even the first frame in
2602
                 * the lace is a key frame. */
2603
                is_keyframe = 0;
2604
                if (last_num_packets != matroska->num_packets)
2605
                    matroska->packets[last_num_packets]->flags = 0;
2606
                if ((res = ebml_read_sint(matroska, &id, &num)) < 0)
2607
                    break;
2608
                if (num > 0)
2609
                    is_bframe = 1;
2610
                break;
2611
            }
2612

    
2613
            default:
2614
                av_log(matroska->ctx, AV_LOG_INFO,
2615
                       "Unknown entry 0x%x in blockgroup data\n", id);
2616
                /* fall-through */
2617

    
2618
            case EBML_ID_VOID:
2619
                res = ebml_read_skip(matroska);
2620
                break;
2621
        }
2622

    
2623
        if (matroska->level_up) {
2624
            matroska->level_up--;
2625
            break;
2626
        }
2627
    }
2628

    
2629
    if (res)
2630
        return res;
2631

    
2632
    if (size > 0)
2633
        res = matroska_parse_block(matroska, data, size, pos, cluster_time,
2634
                                   duration, is_keyframe, is_bframe);
2635

    
2636
    return res;
2637
}
2638

    
2639
static int
2640
matroska_parse_cluster (MatroskaDemuxContext *matroska)
2641
{
2642
    int res = 0;
2643
    uint32_t id;
2644
    uint64_t cluster_time = 0;
2645
    uint8_t *data;
2646
    int64_t pos;
2647
    int size;
2648

    
2649
    av_log(matroska->ctx, AV_LOG_DEBUG,
2650
           "parsing cluster at %"PRId64"\n", url_ftell(&matroska->ctx->pb));
2651

    
2652
    while (res == 0) {
2653
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2654
            res = AVERROR_IO;
2655
            break;
2656
        } else if (matroska->level_up) {
2657
            matroska->level_up--;
2658
            break;
2659
        }
2660

    
2661
        switch (id) {
2662
            /* cluster timecode */
2663
            case MATROSKA_ID_CLUSTERTIMECODE: {
2664
                uint64_t num;
2665
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2666
                    break;
2667
                cluster_time = num;
2668
                break;
2669
            }
2670

    
2671
                /* a group of blocks inside a cluster */
2672
            case MATROSKA_ID_BLOCKGROUP:
2673
                if ((res = ebml_read_master(matroska, &id)) < 0)
2674
                    break;
2675
                res = matroska_parse_blockgroup(matroska, cluster_time);
2676
                break;
2677

    
2678
            case MATROSKA_ID_SIMPLEBLOCK:
2679
                pos = url_ftell(&matroska->ctx->pb);
2680
                res = ebml_read_binary(matroska, &id, &data, &size);
2681
                if (res == 0)
2682
                    res = matroska_parse_block(matroska, data, size, pos,
2683
                                               cluster_time, AV_NOPTS_VALUE,
2684
                                               -1, 0);
2685
                break;
2686

    
2687
            default:
2688
                av_log(matroska->ctx, AV_LOG_INFO,
2689
                       "Unknown entry 0x%x in cluster data\n", id);
2690
                /* fall-through */
2691

    
2692
            case EBML_ID_VOID:
2693
                res = ebml_read_skip(matroska);
2694
                break;
2695
        }
2696

    
2697
        if (matroska->level_up) {
2698
            matroska->level_up--;
2699
            break;
2700
        }
2701
    }
2702

    
2703
    return res;
2704
}
2705

    
2706
static int
2707
matroska_read_packet (AVFormatContext *s,
2708
                      AVPacket        *pkt)
2709
{
2710
    MatroskaDemuxContext *matroska = s->priv_data;
2711
    int res = 0;
2712
    uint32_t id;
2713

    
2714
    /* Read stream until we have a packet queued. */
2715
    while (matroska_deliver_packet(matroska, pkt)) {
2716

    
2717
        /* Have we already reached the end? */
2718
        if (matroska->done)
2719
            return AVERROR_IO;
2720

    
2721
        while (res == 0) {
2722
            if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2723
                return AVERROR_IO;
2724
            } else if (matroska->level_up) {
2725
                matroska->level_up--;
2726
                break;
2727
            }
2728

    
2729
            switch (id) {
2730
                case MATROSKA_ID_CLUSTER:
2731
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2732
                        break;
2733
                    if ((res = matroska_parse_cluster(matroska)) == 0)
2734
                        res = 1; /* Parsed one cluster, let's get out. */
2735
                    break;
2736

    
2737
                default:
2738
                case EBML_ID_VOID:
2739
                    res = ebml_read_skip(matroska);
2740
                    break;
2741
            }
2742

    
2743
            if (matroska->level_up) {
2744
                matroska->level_up--;
2745
                break;
2746
            }
2747
        }
2748

    
2749
        if (res == -1)
2750
            matroska->done = 1;
2751
    }
2752

    
2753
    return 0;
2754
}
2755

    
2756
static int
2757
matroska_read_close (AVFormatContext *s)
2758
{
2759
    MatroskaDemuxContext *matroska = s->priv_data;
2760
    int n = 0;
2761

    
2762
    av_free(matroska->writing_app);
2763
    av_free(matroska->muxing_app);
2764
    av_free(matroska->index);
2765

    
2766
    if (matroska->packets != NULL) {
2767
        for (n = 0; n < matroska->num_packets; n++) {
2768
            av_free_packet(matroska->packets[n]);
2769
            av_free(matroska->packets[n]);
2770
        }
2771
        av_free(matroska->packets);
2772
    }
2773

    
2774
    for (n = 0; n < matroska->num_tracks; n++) {
2775
        MatroskaTrack *track = matroska->tracks[n];
2776
        av_free(track->codec_id);
2777
        av_free(track->codec_name);
2778
        av_free(track->codec_priv);
2779
        av_free(track->name);
2780
        av_free(track->language);
2781

    
2782
        av_free(track);
2783
    }
2784

    
2785
    return 0;
2786
}
2787

    
2788
AVInputFormat matroska_demuxer = {
2789
    "matroska",
2790
    "Matroska file format",
2791
    sizeof(MatroskaDemuxContext),
2792
    matroska_probe,
2793
    matroska_read_header,
2794
    matroska_read_packet,
2795
    matroska_read_close,
2796
};